opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/entityownership/EntityOwnerChangeListener.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.datastore.entityownership;
   9
  10 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_ID_QNAME;
  11 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNERS_PATH;
  12 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_OWNER_NODE_ID;
  13 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_QNAME;
  14 import static org.opendaylight.controller.cluster.datastore.entityownership.EntityOwnersModel.ENTITY_TYPE_QNAME;
  15 import com.google.common.base.Objects;
  16 import com.google.common.base.Optional;
  17 import java.util.Collection;
  18 import java.util.Map.Entry;
  19 import org.opendaylight.controller.cluster.datastore.ShardDataTree;
  20 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
  21 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.md.sal.clustering.entity.owners.rev150804.entity.owners.EntityType;
  23 import org.opendaylight.yangtools.yang.common.QName;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  27 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  28 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  30 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  31 import org.slf4j.Logger;
  32 import org.slf4j.LoggerFactory;
  33
  34 /**
  35  * A DataChangeListener that listeners for entity owner changes and notifies the EntityOwnershipListenerSupport
  36  * appropriately.
  37  *
  38  * @author Thomas Pantelis
  39  */
  40 class EntityOwnerChangeListener implements DOMDataTreeChangeListener {
  41     private static final Logger LOG = LoggerFactory.getLogger(EntityOwnerChangeListener.class);
  42
  43     private final String localMemberName;
  44     private final EntityOwnershipListenerSupport listenerSupport;
  45
  46     EntityOwnerChangeListener(String localMemberName, EntityOwnershipListenerSupport listenerSupport) {
  47         this.localMemberName = localMemberName;
  48         this.listenerSupport = listenerSupport;
  49     }
  50
  51     void init(ShardDataTree shardDataTree) {
  52         shardDataTree.registerTreeChangeListener(YangInstanceIdentifier.builder(ENTITY_OWNERS_PATH).
  53                 node(EntityType.QNAME).node(EntityType.QNAME).node(ENTITY_QNAME).node(ENTITY_QNAME).build(), this);
  54     }
  55
  56     @Override
  57     public void onDataTreeChanged(Collection<DataTreeCandidate> changes) {
  58         for(DataTreeCandidate change: changes) {
  59             MapEntryNode entityNode = (MapEntryNode) change.getRootNode().getDataAfter().get();
  60
  61             LOG.debug("Entity node updated: {}", change.getRootPath());
  62
  63             String newOwner = extractOwner(entityNode);
  64
  65             String origOwner = null;
  66             Optional<NormalizedNode<?, ?>> dataBefore = change.getRootNode().getDataBefore();
  67             if(dataBefore.isPresent()) {
  68                 MapEntryNode origEntityNode = (MapEntryNode) change.getRootNode().getDataBefore().get();
  69                 origOwner = extractOwner(origEntityNode);
  70             }
  71
  72             LOG.debug("New owner: {}, Original owner: {}", newOwner, origOwner);
  73
  74             boolean isOwner = Objects.equal(localMemberName, newOwner);
  75             boolean wasOwner = Objects.equal(localMemberName, origOwner);
  76             if(isOwner || wasOwner) {
  77                 Entity entity = createEntity(change.getRootPath());
  78
  79                 LOG.debug("Calling notifyEntityOwnershipListeners: entity: {}, wasOwner: {}, isOwner: {}",
  80                         entity, wasOwner, isOwner);
  81
  82                 listenerSupport.notifyEntityOwnershipListeners(entity, wasOwner, isOwner);
  83             }
  84         }
  85     }
  86
  87     private Entity createEntity(YangInstanceIdentifier entityPath) {
  88         String entityType = null;
  89         YangInstanceIdentifier entityId = null;
  90         for(PathArgument pathArg: entityPath.getPathArguments()) {
  91             if(pathArg instanceof NodeIdentifierWithPredicates) {
  92                 NodeIdentifierWithPredicates nodeKey = (NodeIdentifierWithPredicates) pathArg;
  93                 Entry<QName, Object> key = nodeKey.getKeyValues().entrySet().iterator().next();
  94                 if(ENTITY_TYPE_QNAME.equals(key.getKey())) {
  95                     entityType = key.getValue().toString();
  96                 } else if(ENTITY_ID_QNAME.equals(key.getKey())) {
  97                     entityId = (YangInstanceIdentifier) key.getValue();
  98                 }
  99             }
 100         }
 101
 102         return new Entity(entityType, entityId);
 103     }
 104
 105     private String extractOwner(MapEntryNode entityNode) {
 106         Optional<DataContainerChild<? extends PathArgument, ?>> ownerNode = entityNode.getChild(ENTITY_OWNER_NODE_ID);
 107         return ownerNode.isPresent() ? (String) ownerNode.get().getValue() : null;
 108     }
 109 }